WM8775EDSSLASHR datasheet(20/36 Pages) WOLFSON

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WM8775

Product Preview

PP Rev 1.8, June 2004

BIT

LABEL

DEFAULT

DESCRIPTION

In left/right/ I

2S modes:

ADCLRC Polarity (normal)

0 : normal ADCLRC polarity

1: inverted ADCLRC polarity

R11(0Bh)

0001011

Interface Control

ADCLRP

In DSP mode:

0 : Early DSP mode

1: Late DSP mode

By default, ADCLRC is sampled on the rising edge of BCLK and should ideally change on the falling

edge. Data sources that change ADCLRC on the rising edge of BCLK can be supported by setting

the BCP register bit. Setting BCP to 1 inverts the polarity of BCLK to the inverse of that shown in

Figures 12, 13, 14, and 15.

BIT

LABEL

DEFAULT

DESCRIPTION

R11(0Bh)

0001011

Interface Control

ADCBCP

BCLK Polarity (DSP modes)

0 : normal BCLK polarity

1: inverted BCLK polarity

The WL[1:0] bits are used to control the input word length.

BIT

LABEL

DEFAULT

DESCRIPTION

R11(0Bh)

0001011

Interface Control

5:4

ADCWL

[1:0]

Word Length

00 : 16 bit data

01: 20 bit data

10: 24 bit data

11: 32 bit data

Note:

If 32-bit mode is selected in right justified mode, the WM8775 defaults to 24 bits.

In 24 bit I

2S mode, any width of 24 bits or less is supported provided that ADCLRC is high for a

minimum of 24 BCLKs and low for a minimum of 24 BCLKs.

ADC MASTER MODE

Control bit MS selects between audio interface Master and Slave Modes. In Master mode ADCLRC

and BCLK are outputs and are generated by the WM8775. In Slave mode ADCLRC and BCLK are

inputs to WM8775.

BIT

LABEL

DEFAULT

DESCRIPTION

R12(0Ch)

0001100

Interface Control

ADCMS

Audio Interface Master/Slave Mode

select:

0 : Slave Mode

1: Master Mode

MASTER MODE ADCLRC FREQUENCY SELECT

In Master mode the WM8775 generates ADCLRC and BCLK. These clocks are derived from the

master clock. The ratio of MCLK to ADCLRC is set by ADCRATE.

BIT

LABEL

DEFAULT

DESCRIPTION

R12(0Ch)

0001100

ADCLRC Frequency

Select

2:0

ADCRATE[2:0]

010

Master Mode MCLK:ADCLRC

ratio select:

010: 256fs

011: 384fs

100: 512fs

101: 768fs

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